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#!/bin/bash
#
# Borg script for home folder backups.
# Adapted from https://borgbackup.readthedocs.io/en/stable/quickstart.html#automating-backups
#
# Example config to be put at ~/.config/borger/destination-name:
#
# # Backup destination
# export SSH_SERVER="user@host"
# export SSH_PORT="2202"
#
# # Repository path
# export BORG_REPO_DIR="/var/backups/users/$USER/borg"
# export BORG_REPO="ssh://$SSH_SERVER:$SSH_PORT/$BORG_REPO_DIR"
#
# # Setting this, so you won't be asked for your repository passphrase:
# #export BORG_PASSPHRASE='HACKME'
# #export BORG_PASSCOMMAND='pass show backup'
# #export BORG_PASSCOMMAND='keyringer default decrypt pessoal/backups/borg 2> /dev/null'
#
# # Backup config
# keepdaily="7"
# keepweekly="4"
# keepmonth="6"
# encryption="keyfile"
# placeholder="{user}"
# Parameters
BASENAME="`basename $0`"
DESTINATION="$1"
OPTION="$2"
BASE_CONFIG="$HOME/.config/borger"
CONFIG="$BASE_CONFIG/$DESTINATION"
# Print info
function info {
printf "[$BASENAME] [%s] %s\n" "$(date)" "$*" >&2;
}
# Fata error
function fatal {
info [fatal] $*
exit 1;
}
function borger_usage {
# Ensure we have our base config folder
mkdir -p $BASE_CONFIG
# List available targets
if [ -z "$DESTINATION" ]; then
echo "usage: $BASENAME <destination> [--check]"
echo -n "available destinations from $BASE_CONFIG: "
ls $BASE_CONFIG
exit 1
fi
}
# Config
function borger_config {
# Ensure we have an username
if [ -z "$USER" ]; then
USER="`whoami`"
fi
# In case your home folder is a symlink
if [ ! -z "`readlink $HOME`" ]; then
ORIG="`readlink $HOME`"
else
ORIG="$HOME"
fi
# Default backup config
keepdaily="7"
keepweekly="4"
keepmonth="6"
encryption="keyfile"
placeholder="{user}"
if [ -e "$CONFIG" ] ; then
source $CONFIG
else
fatal "No such config $CONFIG"
fi
# Setting this, so the repo does not need to be given on the commandline:
if [ -z "$BORG_REPO" ]; then
export BORG_REPO_DIR="/var/backups/users/$USER/borg"
export BORG_REPO="ssh://$SSH_SERVER:$SSH_PORT/$BORG_REPO_DIR"
fi
}
# Check
function borger_check {
if [ "$OPTION" == "--check" ]; then
borg list
exit $?
fi
}
# Our trap
function borger_trap {
trap 'info Backup interrupted >&2; exit 2' INT TERM
}
# Initialize
function borger_init {
if ! ssh $SSH_SERVER -p $SSH_PORT test -f $BORG_REPO_DIR/config; then
info "Initializing borg repository at $BORG_REPO..."
borg init --encryption=$encryption $BORG_REPO
init_exit=$?
if [ "$init_exit" != "0" ]; then
fatal "Error initializing repository"
fi
fi
}
# Backup the most important directories into an archive named after
# the machine this script is currently running on:
function borger_create {
info "Starting backup..."
borg create \
--verbose \
--filter AME \
--list \
--stats \
--show-rc \
--compression lz4 \
--exclude-caches \
::"${placeholder}-{now}" \
$ORIG
backup_exit=$?
if [ "$backup_exit" != "0" ]; then
fatal "Error creating snapshot"
fi
}
# Use the `prune` subcommand to maintain daily, weekly and monthly archives.
# The '${placeholder}-' prefix is very important to limit prune's operation to
# one specific archive and not apply to archives also.
function borger_prune {
info "Pruning repository..."
borg prune \
--list \
--prefix "${placeholder}-" \
--show-rc \
--keep-daily $keepdaily \
--keep-weekly $keepweekly \
--keep-monthly $keepmonthly \
prune_exit=$?
if [ "$prune_exit" != "0" ]; then
fatal "Error pruning repository"
fi
}
# Main
borger_usage
borger_config
borger_check
borger_trap
borger_init
borger_create
borger_prune
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